Porto Covo is one of the two civil parishes in the municipality of Sines, located along the western Alentejo coast of Portugal, about 170 km (110 mi) south of Lisbon. The population in 2011 was 1,038, in an area of 50.72 km². Known for its beaches and ties to the ocean, the name Porto Covo likely translates as port of the covos, the term covo referring to a fishing net, used for capturing lobsters and crabs.

The earliest record of human settlement in the area of Porto Covo dates to the Carthaginian trading along the coast. By the time of the conquest of Hispania by Rome, the island of Pessegueiro hosted a small fish processing centre (from archaeological excavation of salt tanks linked to this industry).

The parish of Porto Covo, by the middle of the 18th century, was nothing more than a small coastal settlement around a beach and small cove. Its small dimensions was reflected in the number of homes, which numbered only four by 1780. On the island of Pessegueiro, King Phillip II of Spain hoped to found a maritime port to support his claim to the territory and defend against marauding pirates. At that time an artificial rock barrier was constructed to connect the island of Pessegueiro to the coastline. Two forts were constructed on the island, supporting small garrisons to watch over the coast, but today in ruins.

Still in the 18th century, the community of Porto Covo began to become an anchorage for the small fishing boats and small businesses. Yet, even these activities were limited, due to the climatic and ocean conditions which limited the port's accessibility. During these periods, it was difficult entering the cove and, in periods when storms came from the southwest, it was not safe attempting landfall on the island of Pessegueiro.

The area began to occupy an important role after the capitalist Jacinto Fernandes Bandeira, a member of a merchant classes of the capital appeared around the late part of the 18th century. Born on 28 April 1745, he came from a poor family in Viana do Castelo, working for family in the capital, succeeding and becoming wealthy under the government of the Marquess de Pombal: in 1768, at the age of 23, his was a member of the Inquisition; in 1774, he was made a knight in the Order of Christ; and in 1792, he was a secretary, deputy and, later, inspector in the Junta de Comérico (Commission for Commerce). He began using the stylized Bandeira to his name, after being born along the Rua da Bandeira in Viana do Castelo. With his career in ascendancy, Jacinto Fernandes began collecting aristocratic titles, such as the Loyal Knight of the Royal House (Portuguese: Fidalgo Cavaleiro da Casa Real), in 1794. He obtained the right to use the name Senhor de Porto Covo after 13 June 1796, for "his activity to promote the establishment and settlement of Porto Covo, to benefit agriculture, fishing and promotion of the Corte, in addition to diverse commissions in which he held with satisfaction". He realized his project to establish a permanent settlement in Porto Covo, by producing two plans (now archived in the National Archive of Torre do Tombo. Jacinto Fernandes became the alcalde of Vila Nova de Milfontes on 14 November 1802 and later the council to the Royal Finances. He was given the title of Baron of Porto Covo on 15 August 1805.

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